On edit, ( bold type commentary is in retrospect).
Friday practice has begun for the Indy Grand Prix of Sonoma.

Scott Dixon and Helio Castroneves at the end of the day "fastest two" press conference.

Scott Dixon at speed on the way to posting the fast speed of the day.

***

The last practice session of the day has ended with Scott Dixon posting the fastest speed of the day with a Panoz chassis. Ryan Briscoe ran 10th, but that speed will leave him in the 1st (slowest) practice group. (Briscoe would later say that "being in the first practice grouping's all through practice hurt him all weekend" due to that group serving as track sweepers, having to deal with the residue from the Hoosier tires of the Grand Am cars.) Sam Hornish moved up to 6th fastest on this ICS T&S chart but Marco Andretti moving from 8th in the morning session to 4th in the afternoon showed the best gain in the top ten. Here's the IndyCar breakdown of qualifying procedures for road and street courses...

"As part of “Firestone Fast Six” qualifying, practice plays a key role in determining the starting field at the three road- and street-course events.

Under the procedure, all entered cars participate in the initial practice session of the three-day race weekend, with times determining the two groups that will be used in the remaining 30-minute pre-qualifying sessions.

The first day’s combined practice times also determine the event qualifying order. The driver with the fastest lap shall determine if the qualifying order shall proceed based on the fastest lap to the slowest or to invert the field in single-lap qualifying. That decision is made one hour before the scheduled start of qualifications.

At the conclusion of single-lap qualifying, the fastest six cars will participate in a 10-minute, European-style session to determine the first three rows. In this procedure, the top car in single-lap qualifying is not guaranteed the pole."

Pos

Driver

Best Time

Best Speed

 

 

 

Last Lap

1

Scott Dixon (9)

 

1:16.9073

107.662

 

 

 

15

2

Helio Castroneves (3)

 

1:17.1821

107.279

 

 

 

11

3

Dario Franchitti (27)

 

1:17.4507

106.907

 

 

 

12

4

Marco Andretti (26)

 

1:17.4628

106.890

 

 

 

12

5

Bryan Herta (7)

 

1:17.6846

106.585

 

 

 

10

6

Sam Hornish Jr (6)

 

1:17.7288

106.524

 

 

 

12

7

Dan Wheldon (10)

 

1:17.7626

106.478

 

 

 

15

8

Tony Kanaan (11)

 

1:17.7742

106.462

 

 

 

12

9

Vitor Meira (4)

 

1:18.6886

105.225

 

 

 

9

10

Ryan Briscoe (5)

 

1:18.9066

104.934

 

 

 

11

11

Buddy Rice (15)

 

1:19.2190

104.520

 

 

 

14

12

Tomas Scheckter (2)

 

1:19.5964

104.025

 

 

 

11

13

Jeff Simmons (17)

 

1:19.6246

103.988

 

 

 

12

14

Jeff Bucknum (14)

 

1:19.8731

103.664

 

 

 

12

15

Danica Patrick (16)

 

1:19.9005

103.629

 

 

 

11

16

Kosuke Matsuura (55)

 

1:20.1429

103.315

 

 

 

11

17

Scott Sharp (8)

 

1:20.2670

103.156

 

 

 

11

18

Ed Carpenter (20)

 

1:20.6218

102.702

 

 

 

13

The all-important 2nd practice session has begun, the combined times from today help to determine practice groupings and the eventual qualifying order for Saturday. Right now the 2nd group is on the track and they are under a yellow flag for a tow-in for Vitor Meira. Here is a mid-session ICS T&S chart, those shown with the greatest number of laps were in the first group, and with the exception of Ryan Briscoe, all of them are slower in speed than those in the 2nd group (they have run no more than 5 laps).

Pos

Driver

 

Best Time

Best Speed

 

 

 

Last Lap

 

 

1

Scott Dixon (9)

 

1:17.6182

106.676

 

 

 

5

 

 

2

Bryan Herta (7)

 

1:18.0444

106.093

 

 

 

3

 

 

3

Dario Franchitti (27)

 

1:18.0696

106.059

 

 

 

3

 

 

4

Helio Castroneves (3)

 

1:18.1773

105.913

 

 

 

2

 

 

5

Tony Kanaan (11)

 

1:18.1915

105.894

 

 

 

5

 

 

6

Marco Andretti (26)

 

1:18.6252

105.310

 

 

 

3

 

 

7

Dan Wheldon (10)

 

1:18.6457